<SEC-DOCUMENT>0001193125-19-033814-index.html : 20190211
<SEC-HEADER>0001193125-19-033814.hdr.sgml : 20190211
<ACCEPTANCE-DATETIME>20190211150732
ACCESSION NUMBER:		0001193125-19-033814
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20190211
DATE AS OF CHANGE:		20190211

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SEMTECH CORP
		CENTRAL INDEX KEY:			0000088941
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				952119684
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0127

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-20525
		FILM NUMBER:		19584924

	BUSINESS ADDRESS:	
		STREET 1:		200 FLYNN ROAD
		CITY:			CAMARILLO
		STATE:			CA
		ZIP:			93012-8790
		BUSINESS PHONE:		8054982111

	MAIL ADDRESS:	
		STREET 1:		200 FLYNN ROAD
		CITY:			CAMARILLO
		STATE:			CA
		ZIP:			93012-8790

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			FRONTIER CAPITAL MANAGEMENT CO LLC
		CENTRAL INDEX KEY:			0001216488
		IRS NUMBER:				043492668
		STATE OF INCORPORATION:			DE

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		99 SUMMER STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>d691075dsc13g.htm
<DESCRIPTION>SC 13G
<TEXT>
Document 1 - file: d691075dsc13g.htm

</DOCUMENT>
</SEC-DOCUMENT>